418 



of a!! of ihe studies is tha: because of the time lag associated with the recovery data the 

 statistical analyses of the recovery data necessary to validate the results have not been 

 reported. For example, statistical analyses of the recovery data for the Priest Rapids 

 studies conducted from 1984 to 1988 *ill not be available u.r.il the final report is 

 completed. The only statistical analyses reported for the recovery data for the 1986 and 

 1989 sprir.g/surrur.er chinook transportation studies at Lower Granite Dam are the 95% 

 confidence intervals tha: were estimated for the transpon/control ratios measured at 

 Lower Granite Dam. The usefulness of these confidence intervals is in question because 

 of the wide variation in the survival rates among the individual release groups and 

 because of very poor returns for the 1989 study. However, the Review Group did not 

 have the time to conduct any independent statistical tests. 



■ For each of the transponation studies several paired transpon and control groups of 

 marked fish were released over the duration of the study. If recovery information was 

 available by release group it was sununarued and reported in this review. Observed 

 recovery rates and transport/control ratios (T/C) were calculated for each release group 

 even if sample sizes were small because poor remrr^s from releases of large ntimbers of 

 marked fish provided valuable information about the studies. The T/Cs for individual 

 release groups were calculated for comparison with other studies and with information 

 on migration cocdirions. Many of the individual release groups had very poor returns so 

 this data should be interpreted with cautioo. 



Flow data for the years and study periods in question are included at the end of the 

 review repon for comparison wii the iransporution research results. Some comparisons 

 between the flow conditions and the results of the studies were made by the Review 

 Group but limited time prevented anything more than a cursory analysis. There are 

 probably man y factors affecung the survival rates from these studies that should be 

 examined closely. 



We have also attached a copy of a recent summary of the T£.CiI. Workgroup's 

 assessment of the model implications of transport survival 



The following are the major conclusions of the Review Group's evaluation of the 

 transportation studies. A more detailed report of findings is attached. 



MAJOR CONCLUSIONS 



1) T/C ratios have been reponed for some studies (e.g. 1989 

 spring/summer chinook at Lower Granite Dam) without a 

 thorough review of the basic data and without statistical analyses 

 to validate the results. 



2) Rerjm rates aiid T/C ratios at the dams for the studies examined 

 were not calculated separately for wild and hatchery spring. 



